AD7190 Analog Digital Pressure Acquisition Module Strain Bridge 24 Bit ADC High Precision Strain Acquisition Module Analog to Digital PLC/DCS Analog Input Module Strain Gauge

The AD7190 is a low noise complete analog front-end suitable for high-precision measurement applications, with a built-in low noise, 24 bit Σ-Δ Analog to Digital Converter (ADC). On chip low noise programmable gain stage means that small signals can be directly input This device can be configured as two differential inputs or four pseudo differential inputs. The on-chip channel sequencer can enable multiple channels, and the AD7190 performs conversion on each enabled channel in sequence. This can simplify communication with the device. On chip 4.92MHz clock can be used as the clock source of ADC; Alternatively, an external clock or crystal oscillator may be used. The output data rate of the device can vary from 4.7Hz to 4.8kHz This device offers two digital filter options. The selection of filter will affect RMS noise and noise free resolution, setup time and 50Hz/60Hz suppression when operating at the programmed output data rate. For applications where all conversions are required, the AD7190 has a zero latency feature This device uses 5V analog power supply and 2.7V to 5.25V digital power supply with power consumption of 6mA

• Description: AD7190 is an ultra-low noise ADC with built-in Σ-Δ Modulator, buffer, PGA and on chip digital filtering are mainly used to measure signals with wide dynamic range, such as signals in pressure sensor, electronic scale and strain gauge applications. This device can be configured as two differential inputs or four pseudo differential inputs, which can buffer the input or not.
• Characteristics: The root mean square noise of AD7190 is 8.5nV (4.7Hz, G=128). It has 16 bit noise free resolution (2.4kHZ, G=128). The maximum noise free resolution is 22.5 bits (G=1). The offset drift is 5 nV/° C, and the gain drift is 1 ppm/° C, with stable time drift characteristics. It has 2 differential and 4 pseudo differential input channels. There is also an automatic channel sequencer. Programmable gain 1 to 128. Output data rate is 4.7Hz to 4.8kHz.
• Mode register: The mode register is a 24 bit register from which data can be read or written. This register is used to select the working mode, output data rate and clock source. MRO to MR23 indicate the position of bits, and MR indicates that these are mode registers. MR23 represents the first bit of the data stream. The value 0 or 1 indicates the default state of power on and reset of this bit.
• Configuration register: The configuration register is a 24 bit register from which data can be read or written. This register is used to configure the unipolar or bipolar mode of ADC. Use or disable buffer, use or disable excitation current, select gain, and select analog input channel. CON0 to CON23 indicate the position of bits, and CON indicates that these bits belong to the configuration register.
• Chopping enable: ADC offset and offset drift can be minimized when chopping is enabled. Enable chopper will enable analog input pin to continuously reverse; Therefore, when the analog input pin is connected in one direction, the setup time of the sinc filter is allowed to elapse until the effective conversion result is available. Then, the analog input pin is reversed and another valid conversion result is obtained.